ThanksI do have to video sources connected to the tv.
1st on is cable connected to component #2 on the side of the T.V.
2nd dvd connected on the back to the av #1
can you please let me know what am I doing wrong
Thanks

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This issue is actually caused by my cable box. Access the audio SETTINGS on Hand held Cable Remote, and turn on the HDMI and or "Digital Audio Out" option. found on 'more' settings list. This should fix the issue. I had assumed the Cable companeis 'Boot' would have installed this feature during its initialization.

This sounds as if it could be a ballast problem, or a switching power supply transformer problem. Both of these can produce this sound. I would suggest that you have a qualified TV technician repair this set due to the dangerous voltages and currents that could be present. In my experience with these TV I would have the technician pay special attention to the power supply board and the backlight/inverter section which includes the ballast used to fire the backlight.

I would suggest checking the driver circuitry for the LCD screen and I would also check the connectors from the driver board to the LCD. Either a component has begun to malfunction (hence the excessive heat) or the component has becom thermally sensitive and is reacting to existing heat and is allowwing excessive current to pass causing more heat to be generated. In any event have a qualified TV technician look at this problem because he will have the proper equipment to troubleshoot the TV in the proper fashion.

Some models of the TV have PIP as an option, but not installed, and to make it cheaper, they use the same remote and menus, just disable the option, as it's not supported. Best to check the Manufacturer's website to make sure that it does do PIP, not that a related model which has the same user manual does PIP.